Anyone experienced platform "shifting"?

Maybe I'm paranoid, maybe it is little flaws I had not noticed before, but has anyone noticed the shape of their Main Street Platforms changing over time?

I ask because it feels like the front of my platform, down by where the monorail is installed has sagged a bit, down by where the resin meets the base. I also feel like the left side of the platform may have bowed a bit, moving the train track segments out of alignment.

Has anyone else noticed changes to their platform like this? It's not a problem really, might make adding the monorail this summer a bit interesting, but it made me wonder if something was going on here.